Function eraseUTF8CharAt

core/base/UTF8.cpp:452–466

}

size_t eraseUTF8CharAt(std::string& str, size_t utf8CharOffset)
{ 
    if (utf8CharOffset >= str.length())
        return 0;
    const UTF8* source = (const UTF8*)str.data();
    const UTF8* sourceEnd = source + str.length();
    size_t byteOffset = getUTF8ByteOffset(str, utf8CharOffset);
    if (byteOffset == std::string_view::npos)
        return 0;
    auto size = getUTF8SequenceSize(source + byteOffset, sourceEnd);
    if (size == 0)
        return 0;
    str.erase(byteOffset, size);
    return size;
}

bool hasNonAsciiUTF8(const char* str, size_t len)
{